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angular.module("app.directives", [])

.directive("pagination", function($location){
    return {
        restrict: 'A',
        link: function($scope, element, attrs) {
            function getInt (val){
                return parseInt(String(val).replace(/[^0-9]+/, ''));
            }

            var totalRows = getInt($scope[attrs.totalRows]),
                perPage = getInt($scope[attrs.perPage]),
                queryString = $location.search();

            if (totalRows === 0 || perPage === 0)
                return;


            if ("per_page" in queryString){
                perPage = getInt(queryString.per_page);
            }


            var $ele = $(element),
                numPages = Math.ceil(totalRows / perPage),
                html = '',
               
                currentPage = "pag" in queryString? parseInt(queryString.pag) : 1;

           
            if (currentPage < 1){
                currentPage = 1;
               
                queryString.pag = currentPage;
                $location.search(queryString);
            }

            if (currentPage > numPages){
                currentPage = numPages;
               
                queryString.pag = currentPage;
                $location.search(queryString);
            }


            attrs.baseUrl = attrs.baseUrl + "&per_page=" + perPage;


            html += '<ul class="pagination">';

            html += '<li class="'+ (currentPage === 1? 'disabled' : '') +'">';
            html += '<a href="#'+ attrs.baseUrl +'&pag='+ (currentPage-1) +'" aria-label="Previous"><span aria-hidden="true">&laquo;</span></a>';
            html += '</li>';

            for (var i = 1; i <= numPages; i++) {
                html += '<li class="'+ (currentPage === i? 'active' : '') +'">';
                html += '<a href="#'+ attrs.baseUrl +'&pag='+ i +'">'+ i +'</a>';
                html += '</li>';
            }

            html += '<li class="'+ (currentPage === numPages? 'disabled' : '') +'">';
            html += '<a href="#'+ attrs.baseUrl +'&pag='+ (currentPage+1) +'" aria-label="Next"><span aria-hidden="true">&raquo;</span></a>';
            html += '</li>';

            html += '</ul>';


            $ele.html(html);
        }
    };
});